#ifndef _SIGNAL_H
#define _SIGNAL_H

#include <sys/types.h>

typedef int sig_atomic_t;
typedef unsigned int sigset_t;

#define _NSIG             32
#define NSIG            _NSIG

#define SIGHUP           1
#define SIGINT           2
#define SIGQUIT          3
#define SIGILL           4
#define SIGTRAP          5
#define SIGABRT          6
#define SIGIOT           6
#define SIGUNUSED        7
#define SIGFPE           8
#define SIGKILL          9
#define SIGUSR1         10
#define SIGSEGV         11
#define SIGUSR2         12
#define SIGPIPE         13
#define SIGALRM         14
#define SIGTERM         15
#define SIGSTKFLT       16
#define SIGCHLD         17
#define SIGCONT         18
#define SIGSTOP         19
#define SIGTSTP         20
#define SIGTTIN         21
#define SIGTTOU         22

#define SA_NOCLDSTOP    1
#define SA_INTERRUPT    0x20000000
#define SA_NOMASK       0x40000000
#define SA_ONESHOT      0x80000000

#define SIG_BLOCK       0
#define SIG_UNBLOCK     1
#define SIG_SETMASK     2

#define SIG_DFL         ((void (*)(int))0)
#define SIG_IGN         ((void (*)(int))1)
#define SIG_ERR         ((void (*)(int))-1)

#ifdef notdef
#define sigemptyset(mask) ((*(mask) = 0), 1)
#define sigfillset(mask) ((*(mask) = ~0), 1)
#endif

struct sigaction {
    void (*sa_handler)(int);
    sigset_t sa_mask;
    int sa_flags;
    void (*sa_restorer)(void);
};

void (*signal(int _sig, void (*_func)(int)))(int);
int raise(int sig);
int kill(pid_t pid, int sig);
int sigaddset(sigset_t *mask, int signo);
int sigdelset(sigset_t *mask, int signo);
int sigemptyset(sigset_t *mask);
int sigfillset(sigset_t *mask);
int sigismember(sigset_t *mask, int signo);
int sigpending(sigset_t *set);
int sigprocmask(int how, sigset_t *set, sigset_t *oldset);
int sigsuspend(sigset_t *sigmask);
int sigaction(int sig, struct sigaction *act, struct sigaction *oldact);

#endif
